Table of Content

20 December 2012 Volume 25 Issue 6

  

Content

Sensing characteristics of Pd-Deposited WO₃ thin film to hydrogen gas

JIN Guang-Hu, LI Lei, WANG Yue, HAO Zong-Rui

J4. 2012, 25(6):  1-4.  doi:10.3976/j.issn.1002-4026.2012.06.001

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We investigated physicochemical and electrical properties of a Pd-deposited WO₃ thin film based hydrogen gas sensor with Pd thickness, annealing temperature and operating temperature as variables. Experimental results show that WO₃ exhibits tetragonal polycrystalline  at 500 ℃. The addition of Pd suppresses grain growth of WO₃. Pd is an isolated small spherical grain on WO₃ thin film at 500 ℃. It agglomerates an irregular large grain or diffuses into WO₃ at 600 ℃. A 2 nm Pd-deposited WO₃ thin film shows good response and recovery property at 250 ℃.

Determination of organic matter compositions of plant and soil by ozonation chemiluminescence

HOU Guang-Li, FAN Ping-Ping, GAO Yang, SHI Xiao-Mei, WANG Qian

J4. 2012, 25(6):  5-9.  doi:10.3976/j.issn.1002-4026.2012.06.002

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We verified the reaction equation and constructed a model to estimate organic matter composition by chemiluminescence characteristic based on the platform of ozonation chemiluminescence of determining organic matter concentrations. Experimental results show that ozonation chemiluminescence can determine the organic matter compositions of plant and soil. Compared with the traditional method, ozonation chemiluminescence has such positive characteristic as rapidity and no pollution.It therefore has some application value in ecology.

Artificial neural network models based prediction for
ozone-NO_x-HC sensitivity

WANG Zhu-Qing, ZHENG Yi, GONG Xiao-Dong, YANG Bing, YANG Hong-Yan, QI Bin

J4. 2012, 25(6):  10-14.  doi:10.3976/j.issn.1002-4026.2012.06.003

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We constructed a back-propagation neural network (BPNN) model with a P(O₃) sensitivity indicator,  Φ=k_HC+OH［HC］/k_NOx+OH［NO_x］, and influencial factors as its input variables. We employed the model to predict the control factors of ozone formation and its sensitivity character at ocean atmospheric boundary layer of Japan Hailikao island. Prediction results basically conformed with chemical computation results. It indicates that this model has better prediction performance. Our research demonstrates that artificial neural network (ANN) can serve as an effective tool to determine the sensitivity of P(O₃) and to formulate ozone abatement strategy.

Research on barge stability dependent on free water surface

SUN Jin-Wei, FAN Xiu-Tao, ZHENG Shan-Shan, LIU Hai-Feng, WAN Xiao-Zheng, LI Xua-Qun, ZHANG Ji-Ming

J4. 2012, 25(6):  15-20.  doi:10.3976/j.issn.1002-4026.2012.06.004

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We address the impacts of free water surface distribution and tank capacity rate on the floatability and stability of a barge. We also calculate the stability criteria number under wind load. We further analyze the stability of one or two damaged tanks. Our analysis result has some reference for barge towing.

Application of BeiDou 2nd generation satellite  navigation system in marine data buoy supervision and management

LI Wen-Qing, FU Xiao, WANG Wen-Yan, PEI Liang

J4. 2012, 25(6):  21-26.  doi:10.3976/j.issn.1002-4026.2012.06.005

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We employ the positioning and short-message communication functionalities of BeiDou  2nd Satellite Navigation System to implement positioning and data transmission of buoy positions for the supervision and management of large-scale and multi-type buoys. We combine continuous geographic coordinates by BeiDou and GPS positioning together to compensate loss and error of position data. Data segmentation technology is employed to overcome transmission length limit of BeiDou data. Large-scale buoy data are efficiently received and processed by dynamic buffer pool and data stitching. Experiments show that the approach has higher localization accuracy, better communication stability and higher receiving rate. This can satisfy the requirements of ocean buoy management.

Design of a real-time marine dumping monitoring system

QI Yong, CHEN Tian-Fu, LIU Shi-Xuan, FU Xiao, FAN Xiu-Tao, MIAO Bin

J4. 2012, 25(6):  27-29.  doi:10.3976/j.issn.1002-4026.2012.06.006

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      This paper presents a design method for an automatic marine dumping monitoring system. It employs a high-speed single chip processor C8051F020 and a 943-series ultrasonic sensor made by Honywell Corporation. It elimininates the negative impact of ship sway and waves through a high-performance filtering algorithm. We therefore can obtain the exact ship waterline height. Such measurement data as GPS and vessel status are processed by a special encryption algorithm before sent to a database server through a DTU module. These data can serve as the legal basis for a dumping administration department.

A high-precision ambient marine noise monitoring system

LI Lei, LI Jin-Ping, ZHOU Zhong-Hai, LYU Cheng-Xin, LIU Jun-Li, YUAN Jian

J4. 2012, 25(6):  30-33.  doi:10.3976/j.issn.1002-4026.2012.06.007

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      We develop a Michelson interference based ambient marine noise pressure monitoring system. We present a method of signal modulation and compensation. It  improves interference suppression capability and measurement accuracy. We also analyse the cause of error and error elimination method.

Application of chemiluminescence in the measurement of total organic carbon in seawater

REN Guo-Xing, MA Ran, LIU Yan

J4. 2012, 25(6):  34-37.  doi:10.3976/j.issn.1002-4026.2012.06.008

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This paper analyzes the theory of the application of kinetic curve of chemiluminescene to quantitative analysis and presents a method of employing the chemical illumination of ozone and seawater to determine the total organic carbon in seawater. Experimental results demonstrate its effectiveness.

A study on the entry water process of deepwater manifold with pendulous installation method

CAO Song-Rong, JIANG Hui-Lue, LIU Bo

J4. 2012, 25(6):  38-41.  doi:10.3976/j.issn.1002-4026.2012.06.009

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Pendulous installation method is applied to the installation of subsea facilities, which has low requirement for a ship and is conveninent to operate. We employ nonlinear coupling time domain analysis of hull, sling and manifold to construct a hydrodynamic calculation model for ship installation and a Morison model for the installation of sling and submarine facilities. Checking convergence precision, selecting calculation parameters and performing numerical analysis for the entry water process of deepwater manifold have some reference value for domestic deepwater engineering.

Optimization of structure parameters of microperforated panel muffler

HAO Zong-Rui, ZHOU Zhong-Hai, XU Juan, HUI Chao, SUN Yu-Ting, MU Hua

J4. 2012, 25(6):  42-46.  doi:10.3976/j.issn.1002-4026.2012.06.010

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We construct the finite element model of the sound field of a muffler, impose the corresponding boundary conditions on the boundary of the model, and calculate the transmission loss of different structure parameters to investigate the impacts of different structure parameters on the performance of a muffler. Computational results show that the microperforated pipe of 20 mm can suppress the noise of 3~6 kHz. The length of single tube is nine times of quarter-wavelength and the entire tube has three-stage structure. The holes on the tube are square with diameter of 0.4 mm and opening rate of 4.8%.

General purpose graphics processing unit based large-scale pulse compression for a Costas signal

ZHOU Bin, YE Chun-Mao, LI Wen-Wen, SONG Miao-Miao

J4. 2012, 25(6):  47-53.  doi:10.3976/j.issn.1002-4026.2012.06.011

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This paper presents a general purpose graphics processing unit (GPGPU) based pulse compression processing model for parallel Costas signals. Our experiments demonstrate its performance and effectiveness. The processing model will provide a better reference for the design of a high-performance radar signal processing system.

A water volume ratio based ship platform precipitation measurement approach

CUI Tian-Gang, GUO Yan-Ping, JI Yan, LIU Peng

J4. 2012, 25(6):  54-56.  doi:10.3976/j.issn.1002-4026.2012.06.012

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We present a ship platform precipitation measurement approach with water volume ratio as a characteristic parameter based on the fact that volume ratio of water to air in a container is constant when shaking and vibration of the container occur. We address its principle, construct the relationship between capacity and precipitation and perform its verification experiment. The approach provides a new idea for solving the problem of accurate ship platform precipitation measurement.

Design of a AVR based wind speed simulator

SUN Jia, GUO Yan-Ping, QI Sui-Ping, WANG Dong-Ming, LIU Tao

J4. 2012, 25(6):  57-60.  doi:10.3976/j.issn.1002-4026.2012.06.013

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We design a wind speed simulator with the principle of wind sensor, a coder based brushless motor and a AVR microcontroller as the core controller. Experimental results show that the simulator satisfies the requirements for design. It has such positives as small volume, low power consumption, high precision and reliability, so it can accurately test the data of a wind sensor.

Design of automatic test instrument for the function modules of a meteorograph

GUO Yan-Ping, CUI Tian-Gang, SHAO Bao-Min, CHU Wei-Xian

J4. 2012, 25(6):  61-64.  doi:10.3976/j.issn.1002-4026.2012.06.014

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We design an automatic test instrument for solving the problem of quick test of the function modules of an meteorograph. It can obtain the detection result of its function modules by analyzing the acquired data from function modules and comparing them with transmitted standard signal. We also present its design idea and hardware and software design methods. Application results show that the instrument can quickly detect the function modules of a meteorograph. This significantly shorten the detection time, as compared with simple manual detection.

Software design of VC++ based data playback of a ship meteorograph

SONG Wen-Jie, CHU Wei-Xian, SHAO Bao-Min, QI Sui-Ping, WANG Dong-Ming

J4. 2012, 25(6):  65-68.  doi:10.3976/j.issn.1002-4026.2012.06.015

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This paper employ VC++ to implement data playback in view of the negative issue that ship meteorograph deposited data can not be opened by regular methods. The paper also presents the application interface converting stored data. Marine tests show that the data playback software is correct and reliable and that the final created file is well accessible.

Design of object-oriented NetCDF reading desktop software

SHAO Bao-Min, CHU Wei-Xian, QI Sui-Ping

J4. 2012, 25(6):  69-73.  doi:10.3976/j.issn.1002-4026.2012.06.016

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We employ an object-oriented idea to make meta-data and data in a NetCDF objective to solve the issue of the reading for multi-kind and multidemensional isomerous ocean observation data. We also present a class hierarchy which includes file, dimension, attribute, variable and its type. The class hierarchy is encapsulated with a component object model and forms desktop software by integrating grid, tree and chart component. The software is stable and has low system coupling, so it can satisfy the requirement of current data access.

Shore station 2D projection acquisition based wave observation compensation algorithm

XU Yan, WANG Zhong-Qiu, LI Ye, WANG Hong-Ru

J4. 2012, 25(6):  74-78.  doi:10.3976/j.issn.1002-4026.2012.06.017

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We presented a 3D restoration of 2D projection acquisition based correction algorithm for three types of distortion, keystone, oblique and wave height distortion, which were caused by bad photography conditions in marine environment monitoring. A distorted image was restored by coordinate offset and tilt offset correction. Experimental results show that the algorithm can restore a distorted image of any coordinate with higher accuracy and applicability.

Application of K-means clustering algorithm in the recognition of maritime targets

HUA Zhi-Li, LIU Jun-Li, LIU Bo

J4. 2012, 25(6):  79-81.  doi:10.3976/j.issn.1002-4026.2012.06.018

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We employ K-means clustering method to recognize a target in complex ocean scenario in view of the negatives of the traditional image segmentation approaches. Experimental results show that the K-means clustering approach can effectively extract sea targets in complex ocean scenario and keep the detailed information of a target.

Software design of Ethernet based integrated observing platform

YANG Shu-Kai, HUI Li, ZHU Hong-Hai, CHU Shi-Bo, LIU Hui, FU Ming-Yang, ZHAO Jie

J4. 2012, 25(6):  82-86.  doi:10.3976/j.issn.1002-4026.2012.06.019

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We developed an Ethernet based data acquisition and processing software system of integrated ocean observing platform. The system could accurately acquire and process meteorological, hydrological and wave data through B/S and C/S architecture. These data were further shared by wireless Ethernet. The system could therefore provide accurate and reliable data for marine observation and forecast.

Research on MATLAB based ocean wave and ship roll simulation models

LIU Peng, JI Yan, QI Sui-Ping, WANG Dong-Ming, SONG Wen-Jie, SUN Jia

J4. 2012, 25(6):  87-89.  doi:10.3976/j.issn.1002-4026.2012.06.020

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We construct a random ocean wave simulation model based on the analysis of slope angle and energy spectrum of random ocean wave and ship stress. We also employ MATLAB to simulate the slope angle of ocean wave and the angle of roll. This will lay foundation for the control of ship roll and the construction of a stable platform.

Research on course signal filtering based ship heading control

JI Yan, LIU Peng, SONG Wen-Jie

J4. 2012, 25(6):  90-93.  doi:10.3976/j.issn.1002-4026.2012.06.021

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The disturbance torque of ocean wave is much larger than that of a rudder, so it is difficult to reduce yaw angle with rudder control and then the number of noneffective rudder will increase in the case of high ocean wave. We employ a course filter to process yaw angle of a course and reduce the impact of main value frequency of ocean wave on a heading control system. The filter will reduce the response of a heading control system to wave disturbance and then reduce the number of noneffective rudder. This will reduce the energy consumption and wearout of a steering.

Development of a fluorescence approach based sensor for detecting oil content in seawater

CHU Dong-Zhi, CAO Xuan, TANG Yong-Zuo, ZHAO Bin

J4. 2012, 25(6):  94-97.  doi:10.3976/j.issn.1002-4026.2012.06.022

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We designed an online sensor for detecting the oil content in seawater with fluorescence detection technology. Experiments show that its performance is stable, detection limit of 3 μg/L. Its linear detection range can be extended to 1 mg/L by subsection calibration. The sensor therefore preliminarily has online measurement capability of oil content detection in seawater.